Help! I can’t log in to my Wordpress installation to fix a problem that’s stopping people seeing the site at all. Whether I try the admin backend or just my home page, I get the same error about a bad plugin. What to do??

While most of the spam I get on my Wordpress blog is pretty basic stuff, comments like “good point” and “best blog I read this week”, every so often I get a comment that’s in a foreign language. I’m always curious, what do they say? Is there a way to translate a language, even if you don’t know what language it actually is?